Rules governing PRs to Ghost Core

I’m refactoring a comment system I’ve implemented:

It currently uses partials as I’ve reused views. I want to break it down further. I’m new to Ember and I came across helpers. I see helpers are are only available for the core and not for the themes/front end. I’ve managed to enable to register a helper from the folder /content/helpers (Or many helper functions)

In the core, I’ve used Object.assign({}) etc to achieve this…neatly. I see huge possibilities enabling this. Can this be put into the core? What are the rules for creating a PR for the core?